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On entry, and .
The Chebyshev Gauss–Lobatto grid points computed should be accurate to within a small multiple of machine precision.
8Parallelism and Performance
Background information to multithreading can be found in the Multithreading documentation.
d02ucc is not threaded in any implementation.
The number of operations is of the order and there are no internal memory requirements; thus the computation remains efficient and practical for very fine discretizations (very large values of ).